Usually the power supply is a good place to start. Maybe reference back a few posts on how jfurgason listed test voltages to get an idea what information could be useful for others to decipher what potential issues could be.Any idea where to start troubleshooting?
I’m assuming you’ve already seen this page, but just in case you haven’t, it is very helpful.The power supply passed its test when I tested before the rest of the build. Knowing what measurements I should be getting at other test sites could be helpful though. I'll check that out.
Interesting, the first thing it says is that, if your voltage is too low you probably have a problem with a transistor. The one thing I was worried about is the 2N3053 transistor. I seem to have burned the contact off while removing the one I messed up on (forgot the spacer) and wasn't sure it was going to work until I get it to my tech to repair the contact on the PCB.
Thanks for the tip.I wouldn't mess around too much until you figure that part out. What you're measuring there is the resistance on the path of your safety ground from the AC inlet, so you definitely want to make sure that's all squared away before you move on. Try probing around the area just a bit and see if that changes anything on your meter -- sometimes the connection is fine but maybe the probe is touching a bit of solder that increases the impedance reading slightly, or your black probe isn't actually in good contact with the chassis, something like that. At any rate, you do want to make sure that this path has as little resistance as possible since it is a very important one.
Will do. Thanks.It was a holiday in the US last week, plus businesses were gearing up for all of the Black Friday stuff, so it’s not surprising that you didn’t hear back from Hairball.
I don’t have an answer for you about substituting a different resistor value there, but you could certainly just order the correct value from Mouser. If you want to avoid the shipping cost (since you’re buying one 10¢ part), see if you have a local electronics store, or barring that, perhaps a computer store that sells parts for arduino.
Thank you for the help. I ended up ordering a few 7.68K resistors through a national distributor here in Canada. $1 for the parts and $20 for shipping, but what can you do? Need to get this thing up and running. Still no word from Hairball anywhere I've contacted them. Ah well.By a few 82 ohm I mean grab a hand full of resistors close to that and measure them. You may be surprised you have the right combination.
Just in case someone else comes along with a similar issue at some point, this should be 820 ohms and not 82. (This post is more directed at that future person, so BruceARP I hope you won’t read this as pedantic, I think you just missed a zero).You might experiment with another resistor in series with the 6.8 k to equal 7.68k
Try like a few 82ohm or something close.
In a pinch I have found just the right combination to make it work.